The Einstein-de Haas (EdH) effect, predicted in 1908 by the Nobel Laureate Owen W. Richardson, was the test of a very fundamental concept - did circulating electrons give rise to magnetic moments? [1]}. Seven years later, Albert Einstein and Wander J. de Haas experimentally demonstrated the possibility of transferring magnetic to mechanical angular momentum [2]}. Subsequently, their experimental initiative was perfected by Stewart [3]}. The transfer of momentum between electron spins and lattice degrees of freedom in a freely suspended magnetized body is a direct outcome of the angular momentum conservation principle. The rotation can be induced by an externally applied transient magnetic field or temperature. The reverse effect, generation of a magnetic moment by mechanical rotation, called the Barnett effect has also been realized [4]}. The very first gyromagnetic ratio measurements were performed using the EdH effect. At present, \(g\) -factor measurements performed using the EdH technique provide a more accurate value compared to electron-spin resonance or ferromagnetic resonance. In addition, the gyromagnetic ratio has important consequences in the fields of quantum electrodynamics [5]}, Bose-Einstein condensates [6]}, molecular magnetism, nano-magneto-mechanics, spintronics, and ultrafast magnetism [7]}, [8]}.
